1. Block.cpp:6:23: error: 'time' was not declared in this scope
   _tTime = time(NULL);

• I was able to get rid of this one with #include <time.h>

but the rest of these are puzzling me and I am not the best at C++ any ideas appreciated

2. C:\Users<usr>\src\github.com\testchain>g++ -o testchain -std=c++11 main.cpp Block.cpp Blockchain.cpp sha256.cpp
   Block.cpp: In member function 'void Block::MineBlock(uint32_t)':
   Block.cpp:44:12: error: 'sHash' was not declared in this scope
   while (sHash.substr(0, nDifficulty) != str)
   ^
   Block.cpp:56:32: error: 'sHash' was not declared in this scope
   cout << "Block mined: " << sHash << endl;
   ^
   Block.cpp: In member function 'std::__cxx11::string Block::_CalculateHash() const':
   Block.cpp:66:18: error: aggregate 'std::stringstream ss' has incomplete type and cannot be defined
   stringstream ss;
   ^

ide used : codeblocks

l\blocktuto.cpp:11: erreur : 'time' was not declared in this scope
_tTime = time(nullptr);
^

Hello, I'm trying to create a voting system based on your code. How to organize a function that will output data from the chain?